基于等效误差方程的三线阵CCD影像自检校区域网平差

Three-line array CCD imagery self-calibration block adjustment based on equivalent error equations

本文针对机载三线阵CCD影像自检校区域网平差中,待求未知参数众多、法方程巨大而复杂的问题,提出了基于等效误差方程的ADS40影像自检校区域网平差方法。通过采用虚拟误差方程对原始误差方程进行等效改化,构建ADS40影像自检校区域网平差的等效误差方程,从而消去加密点地面坐标改正数,减少平差待求参数,实现法方程的合理简化。试验证明此方法可在保证平差精度的同时,显著提高解算效率。

For self-block adjustment of airbome three-line array CCD ADS40 imagery, there exist difficulties of large number un- known parameters, huge and complex equation, enormous memory occupation and slow problem solving. Aiming at solving these prob- lems, one ADS40 imagery self-block adjustment approach based on equivalent error equation was proposed in the paper. Through the use of the virtual error equation method, the original error equation was changed and transformed to build the equivalent error equation for the self-block adjustment of ADS40 imagery, which would eliminate the ground coordinate corrections of photogrammetric control points, and greatly reduce the number of unknowns, and rationally simplify the structure of the normal equation. Experimental results proved that taking the equivalent error equation approach in the self-block adjustment could effectively reduce the memory allocation and occupation, significantly improve computation efficiency, while ensuring the accuracy of the block adjustment.